T87N
4
Fan operation settings
Cycle rate settings
Fan operation settings:
F: For gas or oil heating systems, leave
the fan operation switch in this factory-
set position (for systems that control the
fan in a call for heat.)
E: Change the switch to this setting for
heat pump or electric heat systems.
(This setting is for systems that allow
the thermostat to control the fan in a call
for heat, if a fan wire is connected to the
G terminal.)
Thermostat mounting
Align the slots on the base with tabs on the
thermostat, then push gently until the
thermostat snaps into place.
Thermostat
Base
Heating System Switch 1 Switch 2
Steam or gravity (1 CPH) On On
High efficiency warm air
(90%+), hot water, or
heat pump (3 CPH) Off On
Gas or oil warm air Off Off
(factory setting) (5 CPH)
Electric warm air (9 CPH) On Off
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